/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/MeshModelingToolsEditorOnlyExp/Public/AttributeEditorTool.h
Reset Lightmap UV channels to Source Channel UV0 and Destination as UVMax+1
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(CallInEditor, Category=LightmapUVs, Meta=(DisplayPriority=3)) void Reset()